Preparation of aromatic azoamines by diazotization/coupling/rearrangement of aromatic amines
US4275003A · kind A · utility
1Cited by
8References
13Claims
0Family size
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Key dates
| Filing date | Feb 9, 1978 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Feb 9, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B37/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Aromatic azoamines are prepared by diazotizing an aromatic amine, coupling the diazonium salt with the aromatic amine, and rearranging the resulting aromatic diazoamine. The several reactions are effected in single stage by introducing vaporous nitrogen oxides to a reaction medium essentially consisting of the aromatic amine [.alpha.], a salt of the aromatic amine [.beta.], and water [.gamma.], with the percentage weight relationship existing among the components .alpha., .beta. and .gamma. being such that: EQU 10<.alpha.<70 EQU 13<.beta. EQU 5<.gamma. EQU .alpha.+.beta.+.gamma.=100
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.